使paramiko库执行命令时在给定的时间强制退出功能的实现

class SshClient(object):

  def __init__(self, ip, port, username, password):
    self.ip = ip
    self.host = host
    self.username = username
    self.password = password

  def exec_command(cmd, timeout):
    log.info(u"在ip:%s上执行命令%s" % (self.ip, cmd))
    sc = paramiko.SSHClient()
    sc.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    # 用来接收stdout stderror status信息
    res = [None, None, None]

    def get_return(start_event, res_list):
      _, cmd_stdout, cmd_stderr = sc.exec_command(command=cmd, timeout=timeout)
      channel = cmd_stdout.channel
      cmd_status = channel.recv_exit_status()
      res_list[0] = cmd_stdout
      res_list[1] = cmd_stderr
      res_list[2] = cmd_status
      start_event.set()  # 表示线程已经执行完毕

    try:
      sc.connect(hostname=self.ip, port=self.port, username=self.username, password=self.password, timeout=30)  # 这里的timeout是连接使用的，与我们要的不同
      start_evt = Event()
      t = Thread(target=get_return, args=(start_evt, res))
      t.start()
      start_evt.wait(timeout=timeout)
      # 执行到这里说明线程已经退出
      if None in res:
        raise Exception(u"命令超时退出")
      stdout, stderr, status = res
      if status != 0:
        raise Exception(u"命令执行返回非0！返回值为%s,错误信息为%s" % (status, stdout.read() + stderr.read()))
      return stdout.read() + stderr.read()
    finally:
      sc.close()
}

import paramiko

ssh = paramiko.SSHClient() # 创建SSH对象
# 允许连接不在know_hosts文件中的主机
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
# 连接服务器
ssh.connect(hostname='192.168.2.103', port=22, username='root', password='123456')

stdin, stdout, stderr = ssh.exec_command('ls') # 执行命令
result = stdout.read() # 获取命令结果
print (str(result,encoding='utf-8'))
ssh.close() # 关闭连接

import paramiko

transport = paramiko.Transport(('192.168.2.103', 22))
transport.connect(username='root', password='123456')

ssh = paramiko.SSHClient()
ssh._transport = transport

stdin, stdout, stderr = ssh.exec_command('df')
print (str(stdout.read(),encoding='utf-8'))

transport.close()

#coding:utf-8
import paramiko
import uuid

class SSHConnection(object):

def __init__(self, host='192.168.2.103', port=22, username='root',pwd='123456'):
self.host = host
self.port = port
self.username = username
self.pwd = pwd
self.__k = None

def connect(self):
transport = paramiko.Transport((self.host,self.port))
transport.connect(username=self.username,password=self.pwd)
self.__transport = transport

def close(self):
self.__transport.close()

def upload(self,local_path,target_path):
# 连接，上传
# file_name = self.create_file()
sftp = paramiko.SFTPClient.from_transport(self.__transport)
# 将location.py 上传至服务器 /tmp/test.py
sftp.put(local_path, target_path)

def download(self,remote_path,local_path):
sftp = paramiko.SFTPClient.from_transport(self.__transport)
sftp.get(remote_path,local_path)

def cmd(self, command):
ssh = paramiko.SSHClient()
ssh._transport = self.__transport
# 执行命令
stdin, stdout, stderr = ssh.exec_command(command)
# 获取命令结果
result = stdout.read()
print (str(result,encoding='utf-8'))
return result

ssh = SSHConnection()
ssh.connect()
ssh.cmd("ls")
ssh.upload('s1.py','/tmp/ks77.py')
ssh.download('/tmp/test.py','kkkk',)
ssh.cmd("df")
ssh.close()